The National Park System contains a magnificent record of geologic time because rocks from each period of the geologic time scale are preserved in park landscapes. No single park has rocks from every geologic period, though some come close. With the help of clocks, calendars, and appointment books, we organize our lives around time. We divide time into years, months, weeks, and days.
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DK Science: Dating Fossils
Radiometric dating - Wikipedia
Amazing sedimentary rocks in the Grand Canyon, Arizona. Licensed under Creative Commons. A sedimentary rock is just what it sounds like: it is a rock that consists of sediment! They can consist of sand, clay, chalk and fossils. As a marine geologist, I find sedimentary rocks very fascinating! Some may think that sedimentary rocks are a bit dull since they aren't created by violent and exciting volcano eruptions from the Earth's mantle like the igneous rocks. No, sedimentary rocks have another type of fascinating origin, and every single rock tells a story if you just know how to "read" them!
How Do Scientists Date Fossils?
The complex of data recorded in fossils worldwide—known as the fossil record —is the primary source of information about the history of life on Earth. Only a small fraction of ancient organisms are preserved as fossils, and usually only organisms that have a solid and resistant skeleton are readily preserved. Most major groups of invertebrate animals have a calcareous skeleton or shell e.
Dating , in geology , determining a chronology or calendar of events in the history of Earth , using to a large degree the evidence of organic evolution in the sedimentary rocks accumulated through geologic time in marine and continental environments. To date past events, processes, formations, and fossil organisms, geologists employ a variety of techniques. These include some that establish a relative chronology in which occurrences can be placed in the correct sequence relative to one another or to some known succession of events.